Question

I am unable to correctly populate a DataGridView checkbox column from a boolean column from a database.

First form_load code:

Me.DataGridView1.DataSource = Me.bindingSource1
GetData("SELECT myInt, myBool, myString " & _
        "FROM " & myFavTable & " " & _
        "WHERE (myInt > 100) ORDER BY myString")

formatGrid()

In GetData I fill myTable with data:

Me.dataAdapter.Fill(myTable)
Me.bindingSource1.DataSource = myTable

And finally I format grid the before showing.

I format it manually because loading is much faster than with automatic formatting.

    With DataGridView1
        .AllowUserToAddRows = False
        .AllowDrop = False
        .AllowUserToOrderColumns = False
        .AllowUserToResizeRows = False
        .SelectionMode = DataGridViewSelectionMode.FullRowSelect
        .MultiSelect = False
        .Dock = DockStyle.Fill
        .EditMode = DataGridViewEditMode.EditProgrammatically

       With .Columns(0)
            .Name = "postN"
            .HeaderText = "Postal"
            .Width = 55
        End With

        With .Columns(1) 'here should be a checkbox
            .Width = 20
        End With

        With .Columns(2)
            .Name = "colCity"
            .HeaderText = "City"
            .Width = 180
        End With
    End With

But with this code, in my column that should show checkboxes the string value 0 is displayed when in database is FALSE.

How in this situation can I get checkboxes in the middle column instead of text?

I try with .Columns.Add… before and after binding but with no wanted results.
That way I can get checkboxes, but in the new column.

Answer 1

In design-time add the columns to the DataGridView and set the middle column as a CheckBoxColumn.

Then set:

With DataGridView1
   .AutoGenerateColumns = False

Edit:
I see the problem now. You need to set the DataPropertyName to be the same as the column.

When you add columns to the DataGridView, in that dialog set the DataPropertyName to match the DataTable (myTable) column Names. That’s the magic behind the mapping.

Here is the code:

DataTable dt = new DataTable();
dt.Columns.Add("TextBoxCol");
dt.Columns.Add("CheckBoxCol");
DataRow dr = dt.NewRow();
dr[0] = "Hello";
dr[1] = false;
dt.Rows.Add(dr);
dr = dt.NewRow();
dr[0] = "World";
dr[1] = true;
dt.Rows.Add(dr);
dataGridView1.DataSource = dt;